Why does the bolt on a cooey model 60 not go in fully?

Well, honey, if that bolt on your Cooey Model 60 ain't goin' in all the way, it's probably because there's something blockin' its path. Could be dirt, rust, or just plain ol' wear and tear. Time to roll up those sleeves and give it a good cleanin' to get that bolt slidin' in smooth as butter.